Re: [COUNTERPATCH] mm: avoid overflowing preempt_count() in mmu_take_all_locks()

From: Avi Kivity
Date: Thu Apr 01 2010 - 12:37:45 EST

On 04/01/2010 02:43 PM, Peter Zijlstra wrote:
On Thu, 2010-04-01 at 13:27 +0200, Peter Zijlstra wrote:
I've almost got a patch done that converts those two, still need to look
where that tasklist_lock muck happens.
OK, so the below builds and boots, only need to track down that
tasklist_lock nesting, but I got to run an errand first.

--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -327,7 +327,7 @@ static void drop_anon_vma(struct rmap_item *rmap_item)

if (atomic_dec_and_lock(&anon_vma->ksm_refcount,&anon_vma->lock)) {
int empty = list_empty(&anon_vma->head);
- spin_unlock(&anon_vma->lock);
+ mutex_unlock(&anon_vma->lock);
if (empty)

You need to convert the atomic_dec_and_lock() as well.

error compiling committee.c: too many arguments to function

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